Retarder

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retarder

[ri ′tärd·ər]
(materials)
A material that inhibits the action of another substance, such as flameproofing agents or substances added to cement to retard setting time. Also known as retardant.
(mechanical engineering)
A braking device used to control the speed of railroad cars moving along the classification tracks in a hump yard.
A strip inserted in a tube of a fire-tube boiler to increase agitation of the hot gases flowing therein.

Retarder

In concrete work, an additive that slows down the setting time, allowing for more time to place the concrete.

retarder

1. In paint, varnish, or lacquer, a high-boiling solvent used to lower evaporation rate of the volatile ingredients.
2. An admixture which delays the setting of cement paste or the setting of mixtures such as mortar or concrete containing cement.
3. An additive, mixed with plaster to control the rate of hardening.
References in periodicals archive ?
beaucoup moins que]Les 307 appels perturbent et retardent les actions de secours des agents de la Protection civile qui ne peuvent s'assurer de la veracite de ces coups de telephone qu'une fois sur place au detriment de veritables appels de secours[beaucoup plus grand que], a souligne M.
And for healthcare centres and hospitals, of which the company has supplied many, there is the cubicle track system which creates private spaces using bioactive, antifungal and fire retardent materials for the blinds and curtains themselves.
He said: "The costume gives me a head start but because of the pyrotechnics it needed to besprayed with flame retardent.
It has now been confirmed that the company, whose main product is a flame retardent for polystyrene, is in the statutory 90-day consultation period, which runs out in January.
Emu/Mrvc/Ii/L/Kile For Mrvc Ph-Ii Rakes, Using Fire Retardent Grade Resin As Per Is: 6746-94 And 25 Percent Fibre Glass Chopped Strand Mat Is: 11551-96 Colour Gray.